I have a Tundra 2002. It cuts off at light when lights are on

What is your question?

Battery is good and replaced alternator. Lights are staying on but switch if off. When lights are turned on truck stalls when I stop.

What makes this problem better or worse?

Better when light switch is off even though lights stay on

How long has your 2002 Toyota Tundra had this problem?

A week